Description: 2013 (MMXIII) will be a common year starting on a Tuesday. In the Gregorian calendar, it will be the 2013th year of the Common Era (CE) and Anno Domini (AD) designations; the 13th year of the 3rd millennium and of the 21st century; and the 4th of the 2010s decade. It will also be the first year to be denoted by four different digits in 26 years (since 1987).